Personally I don't think it is worth the 30 episode investment. Not a lot really happens to be honest, a large majority of the plot gets stuck in the time period when the characters are younger. Sure, it is a comfortable and relaxing drama but everything is super rushed right at the end which I anticipated would formulate a larger majority of the episodes once the characters begin their lives.
Chemistry between the two main leads is questionable. I never really felt any intimacy throughout the drama then they are suddenly close in the closing episodes. Feels a bit artificial to be honest.
Really hard watch.... it would've been tolerable if the female lead's character in this drama wasn't so forced. Felt like watching a child on display for the whole drama
K-Drama 
Chemistry between the two main leads is questionable. I never really felt any intimacy throughout the drama then they are suddenly close in the closing episodes. Feels a bit artificial to be honest.